Design Statements...continued
Static Elongation of 5/8” Sure-D-Braid™
DEACCELERATION
• Harness Extention
• Shock Absorber
Extention
FREE
FALL
B
FALL
ONSET
WORKING
A
SURFACE
MC
ROPE
ELONGATION
E
C
D
NOTE: FALL DISTANCE CAN BE SUBSTANTIALLY REDUCED BY SETTING FALL ARRESTER
AS HIGH AS POSSIBLE ON LIFELINE WHEN IN A STATIONARY WORKING POSITION.
Minimum Clearance = A + B + C + D + E
Minimum Clearance = height required between fall arrester and obstructions or ground
A = Initial height of fall arrester above working surface (only becomes a factor if the
worker is not standing erect when fall occurs)
B = Total free fall distance (fall arrester activation = 1.0 ft; lanyard free fall = 2.0 ft)
C = Extension of harness on Dee-ring
D = Maximum shock absorber extension
E = Elongation of lifeline (see chart on page 7)
Minimum Clearance is calculated using highest (worst case) values.
Minimum Clearance = 3.0 ft + 3.0 ft + 0.5 ft + 3.3 ft + Elongation
Sure-Strong™ System Lifelines
5/8" x 40' MC = 9.8 ft + 2.4ft = 12.2 ft
5/8" x 185' MC = 9.8 ft + 9.7ft = 19.5 ft
Copyright © 2001 MSA
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